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vtkLocator Class Referenceabstract

abstract base class for objects that accelerate spatial searches More...

#include <vtkLocator.h>

Inheritance diagram for vtkLocator:
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Collaboration diagram for vtkLocator:
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Public Types

typedef vtkObject Superclass
 Standard type and print methods. More...
 

Public Member Functions

virtual vtkTypeBool IsA (const char *type)
 Return 1 if this class is the same type of (or a subclass of) the named class. More...
 
vtkLocatorNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses. More...
 
virtual void SetDataSet (vtkDataSet *)
 Build the locator from the points/cells defining this dataset. More...
 
virtual vtkDataSetGetDataSet ()
 
virtual void SetMaxLevel (int)
 Set the maximum allowable level for the tree. More...
 
virtual int GetMaxLevel ()
 
virtual int GetLevel ()
 Get the level of the locator (determined automatically if Automatic is true). More...
 
virtual void SetAutomatic (vtkTypeBool)
 Boolean controls whether locator depth/resolution of locator is computed automatically from average number of entities in bucket. More...
 
virtual vtkTypeBool GetAutomatic ()
 
virtual void AutomaticOn ()
 
virtual void AutomaticOff ()
 
virtual void SetTolerance (double)
 Specify absolute tolerance (in world coordinates) for performing geometric operations. More...
 
virtual double GetTolerance ()
 
virtual void Update ()
 Cause the locator to rebuild itself if it or its input dataset has changed. More...
 
virtual void Initialize ()
 Initialize locator. More...
 
virtual void BuildLocator ()=0
 Build the locator from the input dataset. More...
 
virtual void FreeSearchStructure ()=0
 Free the memory required for the spatial data structure. More...
 
virtual void GenerateRepresentation (int level, vtkPolyData *pd)=0
 Method to build a representation at a particular level. More...
 
virtual vtkMTimeType GetBuildTime ()
 Return the time of the last data structure build. More...
 
void Register (vtkObjectBase *o) override
 Handle the PointSet <-> Locator loop. More...
 
void UnRegister (vtkObjectBase *o) override
 Decrease the reference count (release by another object). More...
 
- Public Member Functions inherited from vtkObject
 vtkBaseTypeMacro (vtkObject, vtkObjectBase)
 
virtual void DebugOn ()
 Turn debugging output on. More...
 
virtual void DebugOff ()
 Turn debugging output off. More...
 
bool GetDebug ()
 Get the value of the debug flag. More...
 
void SetDebug (bool debugFlag)
 Set the value of the debug flag. More...
 
virtual void Modified ()
 Update the modification time for this object. More...
 
virtual vtkMTimeType GetMTime ()
 Return this object's modified time. More...
 
unsigned long AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
unsigned long AddObserver (const char *event, vtkCommand *, float priority=0.0f)
 
vtkCommandGetCommand (unsigned long tag)
 
void RemoveObserver (vtkCommand *)
 
void RemoveObservers (unsigned long event, vtkCommand *)
 
void RemoveObservers (const char *event, vtkCommand *)
 
vtkTypeBool HasObserver (unsigned long event, vtkCommand *)
 
vtkTypeBool HasObserver (const char *event, vtkCommand *)
 
void RemoveObserver (unsigned long tag)
 
void RemoveObservers (unsigned long event)
 
void RemoveObservers (const char *event)
 
void RemoveAllObservers ()
 
vtkTypeBool HasObserver (unsigned long event)
 
vtkTypeBool HasObserver (const char *event)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
 Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, bool(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 Allow user to set the AbortFlagOn() with the return value of the callback method. More...
 
int InvokeEvent (unsigned long event, void *callData)
 This method invokes an event and return whether the event was aborted or not. More...
 
int InvokeEvent (const char *event, void *callData)
 
int InvokeEvent (unsigned long event)
 
int InvokeEvent (const char *event)
 
- Public Member Functions inherited from vtkObjectBase
const char * GetClassName () const
 Return the class name as a string. More...
 
virtual void Delete ()
 Delete a VTK object. More...
 
virtual void FastDelete ()
 Delete a reference to this object. More...
 
void InitializeObjectBase ()
 
void Print (ostream &os)
 Print an object to an ostream. More...
 
virtual void PrintHeader (ostream &os, vtkIndent indent)
 
virtual void PrintTrailer (ostream &os, vtkIndent indent)
 
int GetReferenceCount ()
 Return the current reference count of this object. More...
 
void SetReferenceCount (int)
 Sets the reference count. More...
 
void PrintRevisions (ostream &)
 Legacy. More...
 

Static Public Member Functions

static vtkTypeBool IsTypeOf (const char *type)
 
static vtkLocatorSafeDownCast (vtkObjectBase *o)
 
- Static Public Member Functions inherited from vtkObject
static vtkObjectNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 
static void BreakOnError ()
 This method is called when vtkErrorMacro executes. More...
 
static void SetGlobalWarningDisplay (int val)
 This is a global flag that controls whether any debug, warning or error messages are displayed. More...
 
static void GlobalWarningDisplayOn ()
 
static void GlobalWarningDisplayOff ()
 
static int GetGlobalWarningDisplay ()
 
- Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool IsTypeOf (const char *name)
 Return 1 if this class type is the same type of (or a subclass of) the named class. More...
 
static vtkObjectBaseNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 

Protected Member Functions

virtual vtkObjectBaseNewInstanceInternal () const
 
 vtkLocator ()
 
 ~vtkLocator () override
 
void ReportReferences (vtkGarbageCollector *) override
 
- Protected Member Functions inherited from vtkObject
 vtkObject ()
 
 ~vtkObject () override
 
void RegisterInternal (vtkObjectBase *, vtkTypeBool check) override
 
void UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override
 
void InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=nullptr)
 These methods allow a command to exclusively grab all events. More...
 
void InternalReleaseFocus ()
 
- Protected Member Functions inherited from vtkObjectBase
 vtkObjectBase ()
 
virtual ~vtkObjectBase ()
 
virtual void CollectRevisions (ostream &)
 
 vtkObjectBase (const vtkObjectBase &)
 
void operator= (const vtkObjectBase &)
 

Protected Attributes

vtkDataSetDataSet
 
vtkTypeBool Automatic
 
double Tolerance
 
int MaxLevel
 
int Level
 
vtkTimeStamp BuildTime
 
- Protected Attributes inherited from vtkObject
bool Debug
 
vtkTimeStamp MTime
 
vtkSubjectHelper * SubjectHelper
 
- Protected Attributes inherited from vtkObjectBase
std::atomic< int32_t > ReferenceCount
 
vtkWeakPointerBase ** WeakPointers
 

Detailed Description

abstract base class for objects that accelerate spatial searches

vtkLocator is an abstract base class for spatial search objects, or locators. The principle behind locators is that they divide 3-space into small regions (or "buckets") that can be quickly found in response to queries about point location, line intersection, or object-object intersection.

The purpose of this base class is to provide data members and methods shared by all locators. The GenerateRepresentation() is one such interesting method. This method works in conjunction with vtkLocatorFilter to create polygonal representations for the locator. For example, if the locator is an OBB tree (i.e., vtkOBBTree.h), then the representation is a set of one or more oriented bounding boxes, depending upon the specified level.

Locators typically work as follows. One or more "entities", such as points or cells, are inserted into the locator structure. These entities are associated with one or more buckets. Then, when performing geometric operations, the operations are performed first on the buckets, and then if the operation tests positive, then on the entities in the bucket. For example, during collision tests, the locators are collided first to identify intersecting buckets. If an intersection is found, more expensive operations are then carried out on the entities in the bucket.

To obtain good performance, locators are often organized in a tree structure. In such a structure, there are frequently multiple "levels" corresponding to different nodes in the tree. So the word level (in the context of the locator) can be used to specify a particular representation in the tree. For example, in an octree (which is a tree with 8 children), level 0 is the bounding box, or root octant, and level 1 consists of its eight children.

Warning
There is a concept of static and incremental locators. Static locators are constructed one time, and then support appropriate queries. Incremental locators may have data inserted into them over time (e.g., adding new points during the process of isocontouring).
See also
vtkPointLocator vtkCellLocator vtkOBBTree vtkMergePoints

Definition at line 69 of file vtkLocator.h.

Member Typedef Documentation

◆ Superclass

Standard type and print methods.

Definition at line 76 of file vtkLocator.h.

Constructor & Destructor Documentation

◆ vtkLocator()

vtkLocator::vtkLocator ( )
protected

◆ ~vtkLocator()

vtkLocator::~vtkLocator ( )
overrideprotected

Member Function Documentation

◆ IsTypeOf()

static vtkTypeBool vtkLocator::IsTypeOf ( const char *  type)
static

◆ IsA()

virtual vtkTypeBool vtkLocator::IsA ( const char *  name)
virtual

Return 1 if this class is the same type of (or a subclass of) the named class.

Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObjectBase.

Reimplemented in vtkModifiedBSPTree, vtkOBBTree, vtkKdTree, vtkStaticPointLocator2D, vtkStaticPointLocator, vtkIncrementalOctreePointLocator, vtkPointLocator, vtkStaticCellLocator, vtkPKdTree, vtkIncrementalPointLocator, vtkCellTreeLocator, vtkCellLocator, vtkOctreePointLocator, vtkAbstractCellLocator, vtkSMPMergePoints, vtkNonMergingPointLocator, vtkAbstractPointLocator, vtkKdTreePointLocator, and vtkMergePoints.

◆ SafeDownCast()

static vtkLocator* vtkLocator::SafeDownCast ( vtkObjectBase o)
static

◆ NewInstanceInternal()

virtual vtkObjectBase* vtkLocator::NewInstanceInternal ( ) const
protectedvirtual

◆ NewInstance()

vtkLocator* vtkLocator::NewInstance ( ) const

◆ PrintSelf()

void vtkLocator::PrintSelf ( ostream &  os,
vtkIndent  indent 
)
overridevirtual

Methods invoked by print to print information about the object including superclasses.

Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkObject.

Reimplemented in vtkModifiedBSPTree, vtkOBBTree, vtkStaticPointLocator2D, vtkStaticPointLocator, vtkPointLocator, vtkStaticCellLocator, vtkPKdTree, vtkCellTreeLocator, vtkOctreePointLocator, vtkSMPMergePoints, vtkNonMergingPointLocator, and vtkMergePoints.

◆ SetDataSet()

virtual void vtkLocator::SetDataSet ( vtkDataSet )
virtual

Build the locator from the points/cells defining this dataset.

Reimplemented in vtkKdTree.

◆ GetDataSet()

virtual vtkDataSet* vtkLocator::GetDataSet ( )
virtual

Reimplemented in vtkKdTree.

◆ SetMaxLevel()

virtual void vtkLocator::SetMaxLevel ( int  )
virtual

Set the maximum allowable level for the tree.

If the Automatic ivar is off, this will be the target depth of the locator. Initial value is 8.

◆ GetMaxLevel()

virtual int vtkLocator::GetMaxLevel ( )
virtual

◆ GetLevel()

virtual int vtkLocator::GetLevel ( )
virtual

Get the level of the locator (determined automatically if Automatic is true).

The value of this ivar may change each time the locator is built. Initial value is 8.

◆ SetAutomatic()

virtual void vtkLocator::SetAutomatic ( vtkTypeBool  )
virtual

Boolean controls whether locator depth/resolution of locator is computed automatically from average number of entities in bucket.

If not set, there will be an explicit method to control the construction of the locator (found in the subclass).

◆ GetAutomatic()

virtual vtkTypeBool vtkLocator::GetAutomatic ( )
virtual

◆ AutomaticOn()

virtual void vtkLocator::AutomaticOn ( )
virtual

◆ AutomaticOff()

virtual void vtkLocator::AutomaticOff ( )
virtual

◆ SetTolerance()

virtual void vtkLocator::SetTolerance ( double  )
virtual

Specify absolute tolerance (in world coordinates) for performing geometric operations.

◆ GetTolerance()

virtual double vtkLocator::GetTolerance ( )
virtual

◆ Update()

virtual void vtkLocator::Update ( )
virtual

Cause the locator to rebuild itself if it or its input dataset has changed.

◆ Initialize()

virtual void vtkLocator::Initialize ( )
virtual

Initialize locator.

Frees memory and resets object as appropriate.

Reimplemented in vtkPointLocator, vtkStaticPointLocator2D, vtkStaticPointLocator, and vtkIncrementalOctreePointLocator.

◆ BuildLocator()

virtual void vtkLocator::BuildLocator ( )
pure virtual

◆ FreeSearchStructure()

virtual void vtkLocator::FreeSearchStructure ( )
pure virtual

◆ GenerateRepresentation()

virtual void vtkLocator::GenerateRepresentation ( int  level,
vtkPolyData pd 
)
pure virtual

Method to build a representation at a particular level.

Note that the method GetLevel() returns the maximum number of levels available for the tree. You must provide a vtkPolyData object into which to place the data.

Implemented in vtkIncrementalOctreePointLocator, vtkKdTree, vtkStaticPointLocator2D, vtkPointLocator, vtkStaticCellLocator, vtkModifiedBSPTree, vtkOBBTree, vtkStaticPointLocator, vtkOctreePointLocator, vtkCellLocator, vtkCellTreeLocator, and vtkKdTreePointLocator.

◆ GetBuildTime()

virtual vtkMTimeType vtkLocator::GetBuildTime ( )
virtual

Return the time of the last data structure build.

◆ Register()

void vtkLocator::Register ( vtkObjectBase o)
overridevirtual

Handle the PointSet <-> Locator loop.

Reimplemented from vtkObjectBase.

◆ UnRegister()

void vtkLocator::UnRegister ( vtkObjectBase o)
overridevirtual

Decrease the reference count (release by another object).

This has the same effect as invoking Delete() (i.e., it reduces the reference count by 1).

Reimplemented from vtkObjectBase.

◆ ReportReferences()

void vtkLocator::ReportReferences ( vtkGarbageCollector )
overrideprotectedvirtual

Reimplemented from vtkObjectBase.

Member Data Documentation

◆ DataSet

vtkDataSet* vtkLocator::DataSet
protected

Definition at line 176 of file vtkLocator.h.

◆ Automatic

vtkTypeBool vtkLocator::Automatic
protected

Definition at line 177 of file vtkLocator.h.

◆ Tolerance

double vtkLocator::Tolerance
protected

Definition at line 178 of file vtkLocator.h.

◆ MaxLevel

int vtkLocator::MaxLevel
protected

Definition at line 179 of file vtkLocator.h.

◆ Level

int vtkLocator::Level
protected

Definition at line 180 of file vtkLocator.h.

◆ BuildTime

vtkTimeStamp vtkLocator::BuildTime
protected

Definition at line 182 of file vtkLocator.h.


The documentation for this class was generated from the following file: